<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>主题切换效果</title>
    <style>
        :root {
            --dark-bg: #101214;
            --dark-border: #22272b;
            --dark-surface: #161a1d;
            --dark-text-primary: #dee4ea;
            --dark-text-secondary: #738496;
            --dark-primary: #1d7afc;
            --dark-text-inverse: #ffffff;
            --sunset-bg: #151c19;
            --sunset-border: #424f4a;
            --sunset-surface: #2f3834;
            --sunset-text-primary: #ecd2c5;
            --sunset-text-secondary: #c0ab92;
            --sunset-primary: #c0ab92;
            --sunset-text-inverse: #151c19;
            --sunrise-bg: #ecd2c5;
            --sunrise-border: #d7c9c6;
            --sunrise-surface: #f3e8e5;
            --sunrise-text-primary: #4f2733;
            --sunrise-text-secondary: #685844;
            --sunrise-primary: #a04d66;
            --sunrise-text-inverse: #f3e8e5;
            --light-bg: #f7f8f9;
            --light-border: #f1f2f4;
            --light-surface: #ffffff;
            --light-text-primary: #091e42;
            --light-text-secondary: #626f86;
            --light-primary: #1d7afc;
            --light-text-inverse: #ffffff;
            --bg: var(--dark-bg);
            --border: var(--dark-border);
            --surface: var(--dark-surface);
            --text-primary: var(--dark-text-primary);
            --text-secondary: var(--dark-text-secondary);
            --primary: var(--dark-primary);
            --text-inverse: var(--dark-text-inverse);
        }

        *,
        *:before,
        *:after {
            box-sizing: border-box;
        }

        html {
            box-sizing: inherit;
            font-size: 62.5%;
        }

        html,
        body {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
        }

        body {
            font-size: 1.6rem;
            font-family: "Figtree", system-ui, sans-serif;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1.2rem;
            background: var(--bg);
            color: var(--text-secondary);
        }

        .c-card {
            width: 100%;
            max-width: 650px;
            border: 1px solid var(--border);
            border-radius: 1.6rem;
            padding: 3.2rem;
            background: var(--surface);
            position: relative;
            box-shadow: 0.3px 0.5px 0.7px rgba(0, 0, 0, 0.08), 0.8px 1.6px 2px -0.8px rgba(0, 0, 0, 0.08), 2.1px 4.1px 5.2px -1.7px rgba(0, 0, 0, 0.08), 5px 10px 12.6px -2.5px rgba(0, 0, 0, 0.08);
        }

        .c-card__title {
            margin: 0 0 0.8rem;
            padding: 0;
            line-height: 1.2;
            font-size: 4rem;
            color: var(--text-primary);
        }

        .c-card__description {
            margin: 0;
            padding: 0;
            line-height: 150%;
            font-size: 2rem;
            color: var(--text-secondary);
        }

        .c-button {
            display: inline-flex;
            padding: 1.2rem 2rem;
            background: var(--primary);
            border-radius: 0.8rem;
            line-height: 1;
            cursor: pointer;
            color: var(--text-inverse);
            font-weight: 700;
            user-select: none;
            position: relative;
            transition: all 120ms ease-out;
        }

        .c-button:hover,
        .c-button:focus {
            outline: none;
            transform: scale(1.03);
        }

        .c-theme {
            position: absolute;
            top: 2.4rem;
            right: 2.4rem;
            width: 4rem;
            height: 4rem;
            cursor: pointer;
            display: inline-block;
            overflow: hidden;
            padding: 0;
            margin: 0;
            background: transparent;
            color: var(--text-primary);
            border: 1px solid transparent;
            border-radius: 0.8rem;
            padding: 0.4rem;
            transition: all 120ms ease-out;
        }

        .c-theme:hover,
        .c-theme:focus {
            border-color: var(--border);
        }

        .c-theme:after,
        .c-theme:before {
            content: "";
            position: absolute;
            z-index: 10;
        }

        .c-theme:after {
            top: 0;
            left: 0;
            right: 0;
            height: 0.8rem;
            background: linear-gradient(to bottom, var(--surface), transparent);
        }

        .c-theme:before {
            bottom: 0;
            left: 0;
            right: 0;
            height: 0.8rem;
            background: linear-gradient(to top, var(--surface), transparent);
        }

        .c-theme:focus {
            outline: none;
        }

        .c-theme__grid {
            position: relative;
            width: 3.2rem;
            transition: all 240ms ease-out;
        }

        .c-theme svg {
            width: 3.2rem;
            height: 3.2rem;
        }

        .c-theme svg:focus {
            outline: none;
        }

        .c-box {
            display: flex;
            width: 100%;
            flex-direction: column;
            background: var(--bg);
            color: var(--text-secondary);
            position: relative;
            padding: 1.6rem;
            border-radius: 1.2rem;
            border: 1px solid var(--border);
            user-select: none;
            cursor: pointer;
            transition: all 120ms ease-out;
        }

        .c-box:hover,
        .c-box:focus {
            transform: scale(1.03);
        }

        .c-box__title {
            display: flex;
            align-items: center;
            width: 100%;
        }

        .c-box__icon {
            width: 1.6rem;
            height: 1.6rem;
            margin-right: 0.4rem;
        }

        .c-box__swatches {
            display: flex;
            flex-wrap: wrap;
            margin-top: 0.8rem;
        }

        .c-box--active {
            outline: 4px solid var(--primary);
        }

        .c-box--active:after {
            content: "√";
            position: absolute;
            top: -1.2rem;
            right: -1.2rem;
            height: 2.4rem;
            width: 2.4rem;
            background: var(--primary);
            border-radius: 999px;
            color: var(--text-inverse);
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .c-swatch {
            width: 2rem;
            height: 2rem;
            display: inline-block;
            border-radius: 999px;
            border: 1px solid var(--border);
            margin-right: -0.8rem;
            box-shadow: 0px 1px 1px rgba(0, 0, 0, 0.12), 0px 0px 0px 1px rgba(0, 0, 0, 0.08);
        }

        .c-theme-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            grid-gap: 1.6rem;
            margin: 3.2rem 0;
        }

        @media (max-width: 700px) {
            .c-theme-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
    </style>
</head>

<body>
    <div class="c-card">
        <button class="c-theme" id="themePicker"></button>
        <h1 class="c-card__title">主题示例</h1>
        <div class="c-theme-grid" id="themeGrid"></div><a class="c-button" id="button">切换主题</a>
    </div>
    <script>
        console.clear()
        const themes = ['dark', 'sunset', 'sunrise', 'light'];
        let count = 0;
        const themePicker = document.getElementById('themePicker');
        const themeList = document.getElementById('themeGrid');
        const changeTheme = (theme) => {
            if (count < 3) {
                count += 1;
            } else {
                count = 0
            }
            document.documentElement.style.setProperty('--bg', `var(--${theme}-bg)`);
            document.documentElement.style.setProperty('--border', `var(--${theme}-border)`);
            document.documentElement.style.setProperty('--surface', `var(--${theme}-surface)`);
            document.documentElement.style.setProperty('--text-primary', `var(--${theme}-text-primary)`);
            document.documentElement.style.setProperty('--text-secondary', `var(--${theme}-text-secondary)`);
            document.documentElement.style.setProperty('--primary', `var(--${theme}-primary)`);
            document.documentElement.style.setProperty('--text-inverse', `var(--${theme}-text-inverse)`);
            const themeGrid = themePicker.querySelector('.c-theme__grid')
            if (themeList.querySelector('.c-box--active')) {
                themeList.querySelector('.c-box--active').classList.remove('c-box--active')
            }
            themeList.querySelectorAll('.c-box').forEach(item => {
                if (item.dataset.theme === theme) {
                    item.classList.add('c-box--active')
                }
            })
            switch (theme) {
                case theme = 'dark':
                    themeGrid.style.top = '0'
                    break;
                case theme = 'sunset':
                    themeGrid.style.top = '-3.6rem'
                    break;
                case theme = 'sunrise':
                    themeGrid.style.top = '-7.1rem'
                    break;
                case theme = 'light':
                    themeGrid.style.top = '-10.7rem'
                    break;
            }
        }
        const darkIcon = `<svg fill="currentColor" aria-hidden="true" viewBox="0 0 24 24" tabindex="-1" title="Dark"><path d="M10 2c-1.82 0-3.53.5-5 1.35C7.99 5.08 10 8.3 10 12s-2.01 6.92-5 8.65C6.47 21.5 8.18 22 10 22c5.52 0 10-4.48 10-10S15.52 2 10 2z"></path></svg>`
        const sunsetIcon = `<svg fill="currentColor" aria-hidden="true" viewBox="0 0 24 24" tabindex="-1" title="Sunset"><path d="M20 8.69V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12 20 8.69zM12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6c3.31 0 6 2.69 6 6s-2.69 6-6 6z"></path></svg>`
        const sunriseIcon = `<svg fill="currentColor" aria-hidden="true" viewBox="0 0 24 24" tabindex="-1" title="Sunrise"><path d="M20 15.31 23.31 12 20 8.69V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69zM12 18V6c3.31 0 6 2.69 6 6s-2.69 6-6 6z"></path></svg>`
        const lightIcon = `<svg fill="currentColor" aria-hidden="true" viewBox="0 0 24 24" tabindex="-1" title="Light"><path d="M20 8.69V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12 20 8.69zM12 18c-3.31 0-6-2.69-6-6s2.69-6 6-6 6 2.69 6 6-2.69 6-6 6zm0-10c-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4-1.79-4-4-4z"></path></svg>`
        themePicker.innerHTML = `
    <div class="c-theme__grid">
        ${darkIcon}
        ${sunsetIcon}
        ${sunriseIcon}
        ${lightIcon}
    </div>
`
        themePicker.onclick = () => {
            changeTheme(themes[count])
        }
        document.getElementById('button').onclick = () => {
            changeTheme(themes[count])
        }
        const capitalized = (word) => {
            return word.charAt(0).toUpperCase() + word.slice(1)
        }
        themes.forEach((theme, i) => {
            let box = document.createElement('button');
            box.dataset.theme = theme
            box.onclick = () => {
                changeTheme(themes[i])
            }
            box.classList = 'c-box';
            box.style.setProperty('--bg', `var(--${theme}-bg)`);
            box.style.setProperty('--border', `var(--${theme}-border)`);
            box.style.setProperty('--surface', `var(--${theme}-surface)`);
            box.style.setProperty('--text-primary', `var(--${theme}-text-primary)`);
            box.style.setProperty('--text-secondary', `var(--${theme}-text-secondary)`);
            box.style.setProperty('--primary', `var(--${theme}-primary)`);
            box.style.setProperty('--text-inverse', `var(--${theme}-text-inverse)`);
            const iconRender = (theme) => {
                switch (theme) {
                    case theme = 'dark':
                        return darkIcon
                        break;
                    case theme = 'sunset':
                        return sunsetIcon
                        break;
                    case theme = 'sunrise':
                        return sunriseIcon
                        break;
                    case theme = 'light':
                        return lightIcon
                        break;
                }
            }
            box.innerHTML = `
        <div class="c-box__title">
            <span class="c-box__icon">
                ${iconRender(theme)}
            </span>
            <label>${capitalized(theme)}</label>
        </div>
        <div class="c-box__swatches">
            <span class="c-swatch" style="background: var(--bg)" title="bg"></span>
            <span class="c-swatch" style="background: var(--border)" title="border"></span>
            <span class="c-swatch" style="background: var(--surface)" title="surface"></span>
            <span class="c-swatch" style="background: var(--text-primary)" title="text-primary"></span>
            <span class="c-swatch" style="background: var(--text-secondary)" title="text-secondary"></span>
            <span class="c-swatch" style="background: var(--primary)" title="primary"></span>
            <span class="c-swatch" style="background: var(--text-inverse)" title="text-inverse"></span>
        </div>
    `
            themeList.appendChild(box)
        })
        changeTheme(themes[0])
    </script>
</body>

</html>